105 lines
3.8 KiB
ArmAsm
105 lines
3.8 KiB
ArmAsm
/************************************************************************************
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* arch/arm/src/armv7-a/arm_restorefpu.S
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*
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* Copyright (C) 2013 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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************************************************************************************/
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/************************************************************************************
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* Included Files
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************************************************************************************/
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#include <nuttx/config.h>
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#include <arch/irq.h>
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#ifdef CONFIG_ARCH_FPU
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.file "arm_restorefpu.S"
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/************************************************************************************
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* Public Symbols
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************************************************************************************/
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.globl up_restorefpu
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/************************************************************************************
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* Public Functions
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************************************************************************************/
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.text
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/************************************************************************************
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* Name: up_restorefpu
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*
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* Description:
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* Given the pointer to a register save area (in R0), restore the state of the
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* floating point registers.
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*
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* C Function Prototype:
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* void up_restorefpu(const uint32_t *regs);
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*
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* Input Parameters:
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* regs - A pointer to the register save area containing the floating point
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* registers.
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*
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* Returned Value:
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* This function does not return anything explicitly. However, it is called from
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* interrupt level assembly logic that assumes that r0 is preserved.
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*
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************************************************************************************/
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.globl up_restorefpu
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.type up_restorefpu, function
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up_restorefpu:
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add r1, r0, #(4*REG_S0) /* R1=Address of FP register storage */
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/* Load all floating point registers. Registers are loaded in numeric order,
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* s0, s1, ... in increasing address order.
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*/
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vldmia r1!, {s0-s31} /* Restore the full FP context */
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/* Load the floating point control and status register. At the end of the
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* vstmia, r1 will point to the FPCSR storage location.
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*/
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ldr r2, [r1], #4 /* Fetch the floating point control and status register */
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vmsr fpscr, r2 /* Restore the FPCSR */
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bx lr
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.size up_restorefpu, .-up_restorefpu
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#endif /* CONFIG_ARCH_FPU */
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.end
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